ZENITEL CRB-7 Relaybox for Signal Units Waterproof

The CRB-7 relay box can be used to activate an extra signal device, e.g. rotary or stroboscopic light, in noisy areas. The box is connected in parallel with the telephone line and will activate the signal device on incoming calls. The relay box can activate devices running on 230 VAC, 115 VAC or 24VDC. The delay before the signal device is activated can easily be adjusted with a potentiometer.